Calender, there are Applications, PHP, and Javascript calenders available.
Notes, madmatts quick notes will take care of that.
Address bar, can be easily done with an input box, but do you want it to open in your browser? or somewhere actually on the desktop?

I wouldn't think that there would be anything like this out there that is re-made, it's a bit too unique, but it shouldn't be too hard to put together yourself